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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c03fd28b5839bd60334ddbde0b2126de45350edff4fa05942f60093a469ecd7' 
  AND token = 'NQSJ5R3RgUJv8GuD3jUHb3wI007fF03QLj/SYd1cs5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}